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New Member
At cruise (160mph), the IAS reads 128mph. At pattern speed (80), the IAS reads 75, and this is true all the way down to the runway. Stall speed seems about right, 49 clean and 41 flaps down. Pitot leak? Thx Rolly9
What were the results of your pitot leak check? A static system leak check is also a good idea.This is an RV-9. Static source is on both sides between cockpit and tail. I would think if the A/S is low, I have a Pitot leak or partial block.
At cruise (160mph), the IAS reads 128mph. At pattern speed (80), the IAS reads 75, and this is true all the way down to the runway. Stall speed seems about right, 49 clean and 41 flaps down. Pitot leak? Thx Rolly9
It looks like you had a problem with static source position error (i.e. the static port was at a position were the pressure was not the same as the free stream static pressure). The dam in front of your static port changed the pressure at the port. Static source position error can be measured with a combination of ground and flight testing. Lots more info here.At cruise (160mph), the IAS reads 128mph. At pattern speed (80), the IAS reads 75, and this is true all the way down to the runway. Stall speed seems about right, 49 clean and 41 flaps down. Pitot leak? Thx Rolly9
I had this problem on my RV. Airspeed low and altitude low. It was the placment of the static port. I solved it by putting a small dam in front of the static ports. It wasn't my idea. Van's told me what to do. It works.